For the last several days that I have started my car, I have gotten the warning chim for Oil Change Required, Contact Dealer. I have put approximately 1,500 miles since my last oil change. I have 5,600 miles on the vehicle.

Have you checked with a mechanical gauge to see what your pressure is? You might actually have low oil pressure.

1. As a basic measure I would make sure the correct grade and spec oil is going in the engine. You can no longer trust that a local mechanic or even a dealer service center will necessarily use the required product as stipulated by the manufacturer. It is always better to buy and supply your own so you know the correct product is being used.

2. I would not assume there is a problem with the oil pressure warning light even though there could be.
The first thing the mechanic should have done when you reported the oil pressure issue is to hook up an independent mechanical oil pressure gauge and check oil pressure when the engine is hot at different RPMs. Any oil pressure issue will usually show up at idle when the engine has been warmed up properly and the engine oil is hot (unless you have some kind of intermittent oil pressure relief valve that is sticking). Just replacing parts without actually knowing what the oil pressures are at different RPMs is being sloppy and negligent.
This is what you need to do now. Contact a business that can hook up their own pressure gauge to your engine and have them check the oil pressure readings at various RPMs when the engine is fully warm. If there is a low oil pressure issue it will show up on the oil pressure gauge. As you have a new oil pump there should be no issue now with oil volume or a sticking oil pressure relief valve which on your engine should be part of the oil pump assembly.

3. Worn engines will not be able to sustain required oil pressures. Oil pressure is not produced by the oil pump. The oil pump produces oil flow but the resistance to flow is what produces the oil pressure and that resistance is created by fine clearances between operating engine parts especially on the crankshaft and components connected to it. Once the engine wears the clearances increase and the oil flows past the parts much more easily and produces/builds much less pressure.
How well your engine with over 90000 miles has been maintained depends on how often all the owners changed the engine oil and filter , whether they kept the engine oil level up to full (most owners rarely ever check oil levels between services) and whether they always used the correct product. Manufacturer oil change intervals shown in service schedules can be 10000, 12000 miles or more which is much too infrequent for the type of use 95% of private vehicles experience which typically are on the severe to very severe use end of the spectrum. Engine oil typically needs to be changed at least at half the mileage shown in service books (at least twice as frequently) and thus at least every 5000 miles if you want your engine to last.

The warning light more times than not is coming on because of the emission system. There are several sensors that are hard to diagnose even for a professional with a computer. First place to start which is cheap and easy is to use a fuel treatment for a few tanks of gas. This has worked for me in the past by cleaning out the fuel injectors and fuel system. From there if this does not work you will have to check O2 sensors everywhere they are and replace.

I would contact the dealer . Be careful because some warranties are strict and only allow for the dealer to change the oil while it is covered check it out before you get into a problem that could cost you much $$$$.

Really don't know what he was doing? But it sounds like you need to reset your ecm, "Computer"
You may need to call the dealer on your make of vechile and ask how you do this, But this is for sure where i would start. Good luck and allways get a sec. opinion on major work,

iI you mean 'how to turn change oil light off" go to fuse panel. Open drivers door there is a panel cover on the side of dash board, remove cover there is a red RESET button that resets oil pressure and tire pressure. Turn the ignition key to the on position but don't start the car. Now press and release the reset button the change oil light should start to flash, now press and hold the reset button until you hear chimming hold until chimming stops then release, the change oil light should go off. If you need to reset tire pressure press reset button twice, the first push will make the change oil light flash the second press will make the tire pressure light flash then hold untill chimming stops, light should go out . Hope this helps.

Ford Explorer, Mercury Mountaineer, 2002-06

To reset CHANGE OIL SOON/OIL CHANGE REQUIRED message on the Message Center, press the SET UP control to access the System Check mode. Press and release the RESET button to display “OIL LIFE % HOLD RESET NEW” is displayed. Press and hold the RESET button for 2 seconds until “IF NEW OIL HOLD RESET” is displayed. Press and hold RESET button until “OIL LIFE SET TO 100%” is displayed.

Ford Five Hundred, Freestyle, Mercury Montego 2005-06 Tap the ODO/TRIP button to toggle the display between the odometer and trip odometer. Tap on the ODOiTRIP button again to toggle the display between the trip odometer and OIL LIFE % display. Press and hold the ODO/IRIP button for 2 seconds or more to display OIL LIFE 100%. Your oil life in now reset.
Good luck and print this and keep it in the glove box. Keep me posted if you have any other questions

it may just mean the oil needs topping or you need a filter change

Owners manual has this info. Check with dealer and they will tell you how. Ask for service department. Let me know if this helps. Moe

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Oil Change Reset
A press of the OIL CHANGE RESET switch will allow you to
reset the oil life feature to 100% (or your Personalized Oil Reset
Percentage). After you have the oil changed, you must execute
the following procedure. Press the OIL CHANGE RESET switch
and hold for five seconds as the M/C counts down for five
seconds. After a successful reset the Message Center will display
“OIL LIFE RESET TO 100%.” If you have established a
Personalized Oil Reset Percentage, the display will show that
percentage instead of 100%. To ensure accurate oil life
indicators, perform this reset procedure only after an oil change.
Your Personalized Oil Reset Percentage allows you to establish a
smaller oil change interval than the manufacturer’s
recommended interval. To establish your Personalized Oil Reset
Percentage perform the following procedure:
1. Press and hold the OIL CHANGE RESET switch and press
the RESET switch while the display is still counting down
the 5 seconds to reset. The display will change to “START
OIL LIFE AT XXX%.”
2. Press the OIL CHANGE RESET switch until the displayed
percentage is the Personalized Oil Reset Percentage that you
desire. Your choices are 100%, 90%, 80%, 70%, 60%, 50%,
40% and 30%.